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The reflectivity from Ag surfaces, formed by overcoating Ag-aggregated films deposited on heated substrates, shows interesting double absorptions. They appear in two distinct regions, near and beyond 1 μm and at ∼0.35 μm. The former is discussed in terms of a dipole model of the rough surfaces within the Maxwell-Garnett aprroximation and the latter is proposed to be surface plasmon excitation.
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Tokarsky et al. (1976) studied this question.
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